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Connections
packing problem
Entity
metal
Entity
wood
Entity
International Standard Book Number
Entity
video game
Entity
plastic
Entity
riddle
Entity
paradox
Entity
sudoku
Entity
crossword
Entity
syllogism
Entity
shape
Entity
jigsaw puzzle
Entity
puzzle
Entity
optical illusion
Entity
problem solving
Entity
tangram
Entity
dilemma
Entity
maze
Entity
tessellation
Entity